<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <button id="btn">获取数据</button>
  <ul id="ul"></ul>
  <script>
    let btn = document.getElementById('btn');
    let ul = document.getElementById('ul')
    btn.addEventListener('click', () => {
      // 朝后端发送一个请求，获取到需要的数据
      let xhr = new XMLHttpRequest() // 创建了一个ajax实例
      xhr.open('GET', 'https://mock.mengxuegu.com/mock/65a91543c4cd67421b34c898/movie/movieList', true)
      xhr.send()
      xhr.onreadystatechange = () => { // 检测请求的每个阶段
        if (xhr.readyState == 4 && xhr.status == 200) {
          console.log(JSON.parse(xhr.responseText))
          const movieList = JSON.parse(xhr.responseText).movieList
          for (let i = 0; i < movieList.length; i++) {
            const li = document.createElement('li')
            li.innerText = `${movieList[i].nm} -- ${movieList[i].star}`
            ul.appendChild(li)
          }
        }  
      }
    })
  </script>
</body>
</html>